Types of Memory
- 
Main Memory
- 
DRAM (Dynamic Random Access Memory)
 - 
volatile
 - 
destructive reads
 - 
requires refreshing
 - 
8 to 16 times cheaper than cache
  
 - 
Cache
- 
SRAM (Static Random Access Memory)
 - 
nondestructive reads
 - 
requires more transitors
 - 
8 to 16 faster than DRAM
    
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